Replacing AzureKeyVault with Azure.Extensions.AspNetCore.Configuration.Secrets

I need to update the deprecated package

Microsoft.Extensions.Configuration.AzureKeyVault

Microsoft.Extensions.Configuration.AzureKeyVault

with

Azure.Extensions.AspNetCore.Configuration.Secrets

Azure.Extensions.AspNetCore.Configuration.Secrets

There is no official documentation available. Anyone have ideas on how to start?